
Based on the tensile strength of workpiece material, we prepare following equation to obtain tapping torque of standard formig taps. Condition : Effective length of internal screw is 1.5D. Thread height is 75%.
| Tapping Torque Equation for Forming Taps | Workpiece Materials | Deforming resistance (N/mm 2) |
| General Structure Steels, Low Carbon Steels | 750~850 | |
| Medium Carbon Steels, Alloy Steels | 1150~1350 | |
| Stainless Steels | 1100~1300 | |
| T : Tapping Torque (N-m) Dc : Nominal Diameter of Tap (mm) | Wrought Aluminum | 250~350 |
| P : Pitch (mm) | Aluminum Die Castings | 380~530 |
| Kf : Deforming resistance (N/mm 2) | Coppers, Wrought Copper Alloys | 750~1050 |